sediment(noun, verb) noun1. matter that has been deposited by some natural processSimilar word(s): depositDefinition categories: object, matterSentences with sediment as a noun:- The Nile delta is composed of sediment that was washed down and deposited at the mouth of the river. verb1. deposit as a sedimentDefinition categories: motion, deposit, fix, posit, situate2. settle as sedimentDefinition categories: motion, settle